Size and measurement are two somewhat different concepts. Size can be very general: extra large, small, huge, microscopic. Measurement is exact: five centimeters; 3 liters; 155 kilometers; 45 degrees Fahrenheit, etc.
The two words are different as are the concepts. Sometimes synonyms, but sometimes not.
The translator is frequently not clear enough for a learner .. the "a "in misura was not clear and sounded like an e. There are so many things to noticr in a sentence that being clear is imperative.. continues to be frustrating Are you only interested in your money with no care about our learning.. its getting worse!! :(